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首页> 外文期刊>RSC Advances >Thermal and electroactive shape memory behaviors of poly(L-lactide)/thermoplastic polyurethane blend induced by carbon nanotubes
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Thermal and electroactive shape memory behaviors of poly(L-lactide)/thermoplastic polyurethane blend induced by carbon nanotubes

机译：碳纳米管诱导的聚（L-丙交酯）/热塑性聚氨酯共混物的热和电活性形状记忆行为

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摘要

Poly(L-lactide) (PLLA) based shape memory materials (SMP) recently attracted much attention due to their great potential application in biomedical materials. In this work, we introduced carbon nanotubes (CNTs) into a blend of PLLA/thermoplastic polyurethane (TPU) through a simple melt compounding processing to develop a new kind of PLLA SMP. The effects of CNTs on morphologies of blend composites, the selective location of CNTs, the dynamic mechanical properties of samples and the microstructure of CNTs in the blend composites were characterized using a scanning electron microscope (SEM), a transmission electron microscope (TEM) and rheological measurements, respectively. The results demonstrated that CNTs selectively located in the TPU component and induced apparent change of the blend composite morphology. High content of CNTs also formed the percolated network structure in the material, which resulted in the dramatic decrease of electrical resistivity. The shape memory behaviors of the samples were comparatively investigated in two different conditions, i.e. thermally activated and electrically activated conditions. It was demonstrated that CNTs prevents the thermally activated shape recovery process of the blend composites, especially when CNTs formed the percolated network structure. However, with the aid of electrical actuation, largely accelerated shape recovery process and enhanced degree of shape recovery were achieved for the blend composites containing 5 wt% CNTs, especially at relatively low recovery temperatures. The main mechanism was attributed to the largely enhanced electrical conductivity, which provides more Joule heating in the sample. This work provides an alternative way to develop PLLA-based shape memory materials through a simple melt compounding processing.
机译：基于聚（L-丙交酯）（PLLA）的形状记忆材料（SMP）最近由于其在生物医学材料中的巨大潜力而​​备受关注。在这项工作中，我们通过简单的熔融复合工艺将碳纳米管（CNT）引入PLLA /热塑性聚氨酯（TPU）的混合物中，从而开发出新型的PLLA SMP。碳纳米管对共混复合物的形貌，碳纳米管的选择位置，样品的动态力学性能以及共混复合物中碳纳米管的微观结构的影响使用扫描电子显微镜（SEM），透射电子显微镜（TEM）和流变测量。结果表明，碳纳米管选择性地位于TPU组件中，并引起共混复合物形态的明显变化。高含量的碳纳米管还在材料中形成了渗透的网络结构，这导致电阻率急剧下降。在两种不同的条件下，即热激活和电激活条件下，对样品的形状记忆行为进行了比较研究。已经证明，CNT阻止了共混物复合物的热活化形状恢复过程，特别是当CNT形成渗透的网络结构时。然而，借助于电致动，尤其是在相对较低的恢复温度下，对于包含5wt％CNT的共混复合物，实现了大大加速的形状恢复过程和增强的形状恢复度。其主要机理归因于大大提高的电导率，从而在样品中提供了更多的焦耳热。这项工作为通过简单的熔融复合工艺开发基于PLLA的形状记忆材料提供了另一种方法。

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